
/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#include "SampleCode.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "Sk64.h"
#include "SkCornerPathEffect.h"
#include "SkGradientShader.h"
#include "SkGraphics.h"
#include "SkImageDecoder.h"
#include "SkKernel33MaskFilter.h"
#include "SkPath.h"
#include "SkRandom.h"
#include "SkRegion.h"
#include "SkShader.h"
#include "SkUtils.h"
#include "SkColorPriv.h"
#include "SkColorFilter.h"
#include "SkTime.h"
#include "SkTypeface.h"
#include "SkXfermode.h"

#include "SkStream.h"
#include "SkXMLParser.h"
#include "SkColorPriv.h"
#include "SkImageDecoder.h"

static void setNamedTypeface(SkPaint* paint, const char name[])
    {
    SkTypeface* face = SkTypeface::CreateFromName(name, SkTypeface::kNormal);
    paint->setTypeface(face);
    SkSafeUnref(face);
    }

#if 0
static int newscale(U8CPU a, U8CPU b, int shift)
    {
    unsigned prod = a * b + (1 << (shift - 1));
    return (prod + (prod >> shift)) >> shift;
    }

static void test_srcover565(SkCanvas* canvas)
    {
    const int width = 32;
    SkBitmap bm1, bm2, bm3;
    bm1.setConfig(SkBitmap::kRGB_565_Config, width, 256);
    bm1.allocPixels(NULL);
    bm2.setConfig(SkBitmap::kRGB_565_Config, width, 256);
    bm2.allocPixels(NULL);
    bm3.setConfig(SkBitmap::kRGB_565_Config, width, 256);
    bm3.allocPixels(NULL);

    int rgb = 0x18;
    int r = rgb >> 3;
    int g = rgb >> 2;
    uint16_t dst = SkPackRGB16(r, g, r);
    for (int alpha = 0; alpha <= 255; alpha++)
        {
        SkPMColor pm = SkPreMultiplyARGB(alpha, rgb, rgb, rgb);
        uint16_t newdst = SkSrcOver32To16(pm, dst);
        sk_memset16(bm1.getAddr16(0, alpha), newdst, bm1.width());

        int ia = 255 - alpha;
        int iscale = SkAlpha255To256(ia);
        int dr = (SkGetPackedR32(pm) + (r * iscale >> 5)) >> 3;
        int dg = (SkGetPackedG32(pm) + (g * iscale >> 6)) >> 2;

        sk_memset16(bm2.getAddr16(0, alpha), SkPackRGB16(dr, dg, dr), bm2.width());

        int dr2 = (SkMulDiv255Round(alpha, rgb) + newscale(r, ia, 5)) >> 3;
        int dg2 = (SkMulDiv255Round(alpha, rgb) + newscale(g, ia, 6)) >> 2;

        sk_memset16(bm3.getAddr16(0, alpha), SkPackRGB16(dr2, dg2, dr2), bm3.width());

//        if (mr != dr || mg != dg)
            {
//            SkDebugf("[%d] macro [%d %d] inline [%d %d] new [%d %d]\n", alpha, mr, mg, dr, dg, dr2, dg2);
            }
        }

    SkScalar dx = SkIntToScalar(width+4);

    canvas->drawBitmap(bm1, 0, 0, NULL);
    canvas->translate(dx, 0);
    canvas->drawBitmap(bm2, 0, 0, NULL);
    canvas->translate(dx, 0);
    canvas->drawBitmap(bm3, 0, 0, NULL);
    canvas->translate(dx, 0);

    SkRect rect = { 0, 0, SkIntToScalar(bm1.width()), SkIntToScalar(bm1.height()) };
    SkPaint p;
    p.setARGB(0xFF, rgb, rgb, rgb);
    canvas->drawRect(rect, p);
    }
#endif

static void make_bitmaps(int w, int h, SkBitmap* src, SkBitmap* dst)
    {
    src->setConfig(SkBitmap::kARGB_8888_Config, w, h);
    src->allocPixels();
    src->eraseColor(0);

    SkCanvas c(*src);
    SkPaint p;
    SkRect r;
    SkScalar ww = SkIntToScalar(w);
    SkScalar hh = SkIntToScalar(h);

    p.setAntiAlias(true);
    p.setColor(0xFFFFCC44);
    r.set(0, 0, ww*3/4, hh*3/4);
    c.drawOval(r, p);

    dst->setConfig(SkBitmap::kARGB_8888_Config, w, h);
    dst->allocPixels();
    dst->eraseColor(0);
    c.setBitmapDevice(*dst);

    p.setColor(0xFF66AAFF);
    r.set(ww/3, hh/3, ww*19/20, hh*19/20);
    c.drawRect(r, p);
    }

static uint16_t gBG[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF };

class XfermodesView : public SampleView
    {
        SkBitmap    fBG;
        SkBitmap    fSrcB, fDstB;

        void draw_mode(SkCanvas* canvas, SkXfermode* mode, int alpha,
                       SkScalar x, SkScalar y)
            {
            SkPaint p;

            canvas->drawBitmap(fSrcB, x, y, &p);
            p.setAlpha(alpha);
            p.setXfermode(mode);
            canvas->drawBitmap(fDstB, x, y, &p);
            }

    public:
        const static int W = 64;
        const static int H = 64;
        XfermodesView()
            {
            const int W = 64;
            const int H = 64;

            fBG.setConfig(SkBitmap::kARGB_4444_Config, 2, 2, 4);
            fBG.setPixels(gBG);
            fBG.setIsOpaque(true);

            make_bitmaps(W, H, &fSrcB, &fDstB);
            }

    protected:
        // overrides from SkEventSink
        virtual bool onQuery(SkEvent* evt)
            {
            if (SampleCode::TitleQ(*evt))
                {
                SampleCode::TitleR(evt, "Xfermodes");
                return true;
                }
            return this->INHERITED::onQuery(evt);
            }

        virtual void onDrawContent(SkCanvas* canvas)
            {
            canvas->translate(SkIntToScalar(10), SkIntToScalar(20));

            const struct
                {
                SkXfermode::Mode  fMode;
                const char*         fLabel;
                } gModes[] =
                {
                    { SkXfermode::kClear_Mode,    "Clear"     },
                    { SkXfermode::kSrc_Mode,      "Src"       },
                    { SkXfermode::kDst_Mode,      "Dst"       },
                    { SkXfermode::kSrcOver_Mode,  "SrcOver"   },
                    { SkXfermode::kDstOver_Mode,  "DstOver"   },
                    { SkXfermode::kSrcIn_Mode,    "SrcIn"     },
                    { SkXfermode::kDstIn_Mode,    "DstIn"     },
                    { SkXfermode::kSrcOut_Mode,   "SrcOut"    },
                    { SkXfermode::kDstOut_Mode,   "DstOut"    },
                    { SkXfermode::kSrcATop_Mode,  "SrcATop"   },
                    { SkXfermode::kDstATop_Mode,  "DstATop"   },
                    { SkXfermode::kXor_Mode,      "Xor"       },

                    { SkXfermode::kPlus_Mode,         "Plus"          },
                    { SkXfermode::kMultiply_Mode,     "Multiply"      },
                    { SkXfermode::kScreen_Mode,       "Screen"        },
                    { SkXfermode::kOverlay_Mode,      "Overlay"       },
                    { SkXfermode::kDarken_Mode,       "Darken"        },
                    { SkXfermode::kLighten_Mode,      "Lighten"       },
                    { SkXfermode::kColorDodge_Mode,   "ColorDodge"    },
                    { SkXfermode::kColorBurn_Mode,    "ColorBurn"     },
                    { SkXfermode::kHardLight_Mode,    "HardLight"     },
                    { SkXfermode::kSoftLight_Mode,    "SoftLight"     },
                    { SkXfermode::kDifference_Mode,   "Difference"    },
                    { SkXfermode::kExclusion_Mode,    "Exclusion"     },
                };

            const SkScalar w = SkIntToScalar(W);
            const SkScalar h = SkIntToScalar(H);
            SkShader* s = SkShader::CreateBitmapShader(fBG,
                          SkShader::kRepeat_TileMode,
                          SkShader::kRepeat_TileMode);
            SkMatrix m;
            m.setScale(SkIntToScalar(6), SkIntToScalar(6));
            s->setLocalMatrix(m);

            SkPaint labelP;
            labelP.setAntiAlias(true);
            labelP.setLCDRenderText(true);
            labelP.setTextAlign(SkPaint::kCenter_Align);
            setNamedTypeface(&labelP, "Menlo Regular");
//        labelP.setTextSize(SkIntToScalar(11));

            const int W = 5;

            SkScalar x0 = 0;
            for (int twice = 0; twice < 2; twice++)
                {
                SkScalar x = x0, y = 0;
                for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++)
                    {
                    SkXfermode* mode = SkXfermode::Create(gModes[i].fMode);
                    SkAutoUnref aur(mode);
                    SkRect r;
                    r.set(x, y, x+w, y+h);

                    SkPaint p;
                    p.setStyle(SkPaint::kFill_Style);
                    p.setShader(s);
                    canvas->drawRect(r, p);

                    canvas->saveLayer(&r, NULL, SkCanvas::kARGB_ClipLayer_SaveFlag);
                    //       canvas->save();
                    draw_mode(canvas, mode, twice ? 0x88 : 0xFF, r.fLeft, r.fTop);
                    canvas->restore();

                    r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
                    p.setStyle(SkPaint::kStroke_Style);
                    p.setShader(NULL);
                    canvas->drawRect(r, p);

#if 1
                    canvas->drawText(gModes[i].fLabel, strlen(gModes[i].fLabel),
                                     x + w/2, y - labelP.getTextSize()/2, labelP);
#endif
                    x += w + SkIntToScalar(10);
                    if ((i % W) == W - 1)
                        {
                        x = x0;
                        y += h + SkIntToScalar(30);
                        }
                    }
                x0 += SkIntToScalar(400);
                }
            s->unref();
            }

    private:
        typedef SampleView INHERITED;
    };

//////////////////////////////////////////////////////////////////////////////

static SkView* MyFactory()
    {
    return new XfermodesView;
    }
static SkViewRegister reg(MyFactory);

